Why Are My Doors Sticking & Walls Cracking? Foundation Movement vs. Humidity in Alabama Homes

Why Alabama Homes Deal With Both Problems

Sticking doors and cracking walls in Alabama usually come from one of two things: moisture in the air or movement in the ground. Our homes get plenty of both.

Humidity

Alabama summers are long and sticky, and wood soaks up that moisture. Interior doors, door frames, and trim can swell just enough to rub or refuse to latch. Once fall and winter dry the air out, the wood shrinks back and the problem often goes away on its own.

Red Clay Soil

Much of North Alabama sits on red clay, and clay reacts to water. It swells when it’s wet and shrinks when it dries. That push and pull moves the ground under your foundation, and your home moves with it. Over time, door frames get pulled out of square and walls crack where they’re under the most stress.

A few things make the soil side worse:

• Poor drainage: Clogged gutters and short downspouts dump water right against the foundation.

• Big weather swings: A dry late summer followed by heavy fall rain takes the soil from shrinking to swelling fast.

• Older crawl space homes: Wood supports under the house can weaken from moisture and let floors and frames shift.

We see these patterns everywhere we work, from older brick homes in Decatur to hillside lots around Birmingham and neighborhoods all over Huntsville.

If you want to dig deeper, here’s how North Alabama weather affects your foundation.

Humidity or Foundation? How To Tell the Difference

If a door only sticks in summer and works fine in winter, humidity is the likely cause. If it sticks year-round, keeps getting worse, or comes with cracks, the foundation may be moving.

Signs It’s Probably Humidity

• The door sticks in summer and loosens up when the weather cools

• It’s one or two wooden doors, often in a bathroom or a room without much airflow

• There are no new cracks in the walls around the door

• The door rubs evenly along one edge instead of catching at one corner

• Running the AC or a dehumidifier makes a noticeable difference

Signs It’s Probably Foundation Movement

• The door sticks all year, or it’s getting harder to close over time

• Several doors stick, especially on the same side of the house

• There are diagonal cracks running from the corners of door or window frames

• Doors swing open or shut on their own

• Windows are also getting hard to open or lock

• You’re noticing sloping floors or cracks in the brick outside

Foundation movement rarely shows up as just one symptom. When a sticking door comes with cracks, slopes, or gaps, that combination is usually the house telling you something underneath has shifted.

Try the Door Gap Test

Close the door and look at the gap between the door and the frame, especially across the top. If the gap is fairly even but the door is tight along one edge, swelling is the likely cause. If the gap is wide at one corner and pinched at the other, like a wedge, the frame has probably shifted out of square. That’s a common sign of foundation movement.

Wall Cracks: Which Ones Matter?

Most hairline cracks are cosmetic. Cracks that run diagonally, keep growing, or show up alongside sticking doors are the ones worth a closer look.

Usually Nothing To Worry About

• Thin, hairline cracks that run straight up and down

• Small cracks along drywall seams or tape lines

• A crack that shows up once and doesn’t change

Worth a Closer Look

• Diagonal cracks that start at the corners of doors or windows

• Stair-step cracks in exterior brick or block

• Cracks wider than about a quarter inch

• Cracks that come back after you’ve patched them

• Cracks where one side sits higher than the other

Here’s an easy way to keep track: mark each end of the crack with a pencil and write the date next to it. If it’s grown in a few weeks or months, the movement is still happening.

For a full breakdown of crack types, read our guide on when to worry about foundation cracks.

How Foundation Movement Gets Fixed

The right foundation repair depends on what’s moving and why. A good inspection finds the cause first, then matches the fix to it. The most common solutions include:

• Helical piers: Steel piers installed down to stable soil to stop a settling foundation and support it long term.

• Floor supports: Added under sagging areas to level floors and take stress off the framing.

• Wall bracing: Carbon fiber or steel bracing that stabilizes bowing basement walls.

Here’s what that looks like in a real home. A Huntsville homeowner called us shortly after buying a house on a slope off Green Mountain. The brick out front had stair-step cracks, and the front porch had pulled about 6 inches away from the house. Our crew installed 22 helical piers around the home and porch, took care of the permits the slope zone required, stabilized the foundation, and closed the gap. See the full Huntsville helical pier project.

Frequently Asked Questions